<template>
  <div class="login_container">
    <!--登录头像区域  -->
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>

      <el-form
        label-width="0px"
        class="form_input"
        :model="loginFrom"
        :rules="loginFormRules"
        ref="loginFromRef"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginFrom.username"
            prefix-icon="iconfont icon-user"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginFrom.password"
            prefix-icon="iconfont icon-3702mima"
            type="password"
          >
          </el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="form_btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="loginFromRest">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //表单数据绑定
      loginFrom: {
        username: "admin",
        password: "123456"
      },
      //表单验证规则
      loginFormRules: {
        username: [
          { required: true, message: "请输入登录名称", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "长度在 3 到 10 个字符",
            trigger: "blur",
          },
        ],
        password: [
          { required: true, message: "请输入登录密码", trigger: "blur" },
          {
            min: 6,
            max: 15,
            message: "长度在 6 到 15 个字符",
            trigger: "blur",
          },
        ],
      },
    };
  },
  methods: {
    loginFromRest() {
      //$ref.loginFromRef 通过ref获取表单实例对象
      this.$refs.loginFromRef.resetFields();
    },
    //登录预验证
    login() {
      this.$refs.loginFromRef.validate(async (valid) => {
        //Promise允许被简化  await只能用在被async修饰的方法中
        if(!valid) return;
        //通过解构赋值解构只需要的data
        console.log(this.loginFrom)
        const {data:res} = await this.$http.post('login',this.loginFrom)
        if (res.meta.status!=200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        //1.将登录成功之后的token,保存到sessionStorage中
        //  1.1 项目中除了登录之外的其他API接口,必须在登录之后才能访问
        //  1.2 token只应在当前网站打开期间生效,所以token保存在sessionStorage中
        //2.通过编程式导航跳转到后台主页,路由地址是/home
        window.sessionStorage.setItem('token',res.data.token)  
        this.$router.push('/home')  
      });
    },
  },
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;

  .login_box {
    padding: 10px;
    width: 450px;
    height: 300px;
    background-color: #fff;
    position: absolute;
    border-radius: 3px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      padding: 10px;
      border: 1px solid #eee;
      width: 130px;
      height: 130px;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      border-radius: 50%;
      background-color: #fff;
      box-shadow: 0 0 10px #ddd;

      img {
        height: 100%;
        width: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }

    .form_btns {
      display: flex;
      justify-content: flex-end;
    }
  }

  .form_input {
    bottom: 30%;
    width: 100%;
    position: absolute;
    top: 50%;
    transform: translate(-2%, -50%);
    padding: 0 20px;
    box-sizing: border-box;
  }
}
</style>